release-please fails when trying to connect to a HTTP only proxy via HTTP CONNECT
See:

It would probably make sense just to take the whole proxy URL (E.G. http://my-proxy:80) and apply it to the HTTP agent instead of making assumptions about the users environment?

Happy to raise a PR for this 🙂

Note: This would also require an update in the GitHub action to stop it splitting the proxy input and would probably therefore be a breaking change for both release-please and the action.

Environment details

• OS: Ubuntu 22.04 x64 and Windows 10 x64
• Node.js version: 20.12.1
• npm version: 10.5.1
• release-please version: 16.10.1

Steps to reproduce

1. Use a proxy value such as my-proxy:80 which only accepts http connections
2. Get an error when release-please incorrectly tries to use https connection to the proxy.